A very thin electrical strip providing heat flux of 909 W/m2 is attached to the plate as shown in the figure. The system is under steady state conditions where the bottom side of the system is perfectly insulated and the top side is exposed to convection and radiation (emissivity and temperature values are shown in the figure). If the top surface temperature of the plate is 348 K calculate the convective heat transfer coefficient in W/m2K.Round your answer to the nearest integer value and write only the numerical value in the provided box, not the units. A very thin electrical strip providing heat flux of 909 W/m2 is attached to the plate as shown in the figure. The system is under steadystate conditions where the bottom side of the system is perfectly insulated and the top side is exposed to convection and radiation(emissivity and temperature values are shown in the figure). If the top surface temperature of the plate is 348 K calculate the convectiveheat transfer coefficient in W/m K.Round your answer to the nearest integer value and write only the numerical value in the provided box, not the units.Tsurr = T = 320 K8 = 0.40Ttopelectrical strip

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A very thin electrical strip providing heat flux of 909 W/m2 is attached to the plate as shown in the figure. The system is under steady state conditions where the bottom side of the system is perfectly insulated and the top side is exposed to convection and radiation (emissivity and temperature values are shown in the figure). If the top surface temperature of the plate is 348 K calculate the convectiv heat transfer coefficient in W/m K. Round your answer to the nearest integer value and write only the numerical value in the provided box, not the units. Tsurr = T = 320 K E = 0.40 Ttop electrical strip

A very thin electrical strip providing heat flux of 909 W/m2 is attached to the plate as shown in the figure. The system is under steady state conditions where the bottom side of the system is perfectly insulated and the top side is exposed to convection and radiation (emissivity and temperature values are shown in the figure). If the top surface temperature of the plate is 348 K calculate the convectiv heat transfer coefficient in W/m K. Round your answer to the nearest integer value and write only the numerical value in the provided box, not the units. Tsurr = T = 320 K E = 0.40 Ttop electrical strip

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.18P: The heat transfer coefficient for a gas flowing over a thin float plate 3-m long and 0.3-m wide...

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1.1 On a cold winter day, the outer surface of a 0.2-m-thick concrete wall of a warehouse is exposed to temperature of –5°C, while the inner surface is kept at 20°C. The thermal conductivity of the concrete is 1.2 W/m K. Determine the heat loss through the wall, which is 10-m long and 3-m high. Problem 1.1
2.51 Determine by means of a flux plot the temperatures and heat flow per unit depth in the ribbed insulation shown in the accompanying sketch.
1.10 A heat flux meter at the outer (cold) wall of a concrete building indicates that the heat loss through a wall of 10-cm thickness is . If a thermocouple at the inner surface of the wall indicates a temperature of 22°C while another at the outer surface shows 6°C, calculate the thermal conductivity of the concrete and compare your result with the value in Appendix 2, Table 11.
3.16 A large, 2.54-cm.-thick copper plate is placed between two air streams. The heat transfer coefficient on one side is and on the other side is . If the temperature of both streams is suddenly changed from 38°C to 93°C, determine how long it takes for the copper plate to reach a temperature of 82°C.
2.9 In a large chemical factory, hot gases at 2273 K are cooled by a liquid at 373 K with gas-side and liquid-side convection heat transfer coefficients of 50 and , respectively. The wall that separates the gas and liquid streams is composed of a 2-cm thick oxide layer on the gas side and a 4-cm thick slab of stainless steel on the liquid side. There is a contact resistance between the oxide layer and the steel of . Determine the rate of heat loss from hot gases through the composite wall to the liquid.
1.4 To measure thermal conductivity, two similar 1-cm-thick specimens are placed in the apparatus shown in the accompanying sketch. Electric current is supplied to the guard heater, and a wattmeter shows that the power dissipation is 10 W. Thermocouples attached to the warmer and to the cooler surfaces show temperatures of 322 and 300 K, respectively. Calculate the thermal conductivity of the material at the mean temperature in W/m K. Problem 1.4
The heat transfer coefficient for a gas flowing over a thin float plate 3-m long and 0.3-m wide varies with distance from the leading edge according to hc(x)=10x1/4Wm2K If the plate temperature is 170C and the gas temperature is 30C, calculate (a) the average heat transfer coefficient, (b) the rate of heat transfer between the plate and the gas, and (c) the local heat flux 2 m from the leading edge. Problem 1.18
An uninsulated 100-mm diameter steam pipe runs for 25-meters inside a room whose walls and air are at a temperature of 25C .The superheated steam inside the pipe maintains the temperature at the pipe surface at 150C. If the natural convection heat transfer coefficient of the air outside the pipe is 10 W/(m^2)(k)and the surface emissivity is 0.8, compute for the total thermal resistance at the outside surface of the pipe in K/W.
The heat conducts through the shape below. The temperature of the right face is 93 °C, while the left face is at 23 °C. If the top and bottom faces are completely insulated, and the thermal conductivity of the material decreases with decreasing temperature. * Assume that the thermal conductivity is 100 at 23, decreased to 10 at 93. A) Sketch the temperature profile inside the plate. B) If both sides of the plate in the above problem is exposed to air: Left side (h = 20 W/m2K, TL = 20 °C) and right side (h = 90 W/m2K). Calculate the temperature of the air on the right side.
The wall of a furnace is made up of a material which has thermal conductivity of 2.65 W/m◦C and a thicknesses 300 mm. The inner side of the furnace wall is exposed to hot gases at 1200 ⁰C with a convection coefficient of 20 W/m2⁰C and the inside the surface is at 700 ⁰C. The air outside the furnace is at 20⁰C with a convection coefficient of 15 W/m2⁰C. Draw a clear diagram representing the system Determine the temperature of the outside surface of the furnace The rate of heat loss from the furnace.
A fluid has a temperature of 100C and thermal film coefficient of 50 W/m^2-K. Solve for the heat transferred per sq m of contact if the surface it is in contact with has a surface temperature of 20C.
A long stainless-steel (AISI 316) steam pipe, with an inside diameter of 6.00 cm and an outside diameter of 8.00 cm, is covered with a layer of asbestos insulation (k = 0.150 W/m-K) 1.00 cm thick, which in turn is covered with foam insulation (k = 0.044 W/m-K) 6.00 cm thick. The inside surface temperature of the stainless-steel steam pipe is measured to be 250.0°C, while the outside surface of the foam is exposed to convection, T_inf = 25.0°C, h_inf = 15.0 W/m^2-K. • Draw and label a sketch of this system. Include dimensions, known temperatures, etc. • Draw and completely label the corresponding 1-D steady-state conduction resistor diagram. • Determine the heat transfer rate through the pipe per unit length. • Calculate the temperature at the asbestos/foam interface.